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Journal of Neuroscience, Vol 15, 2985-2994, Copyright © 1995 by Society for Neuroscience
Neuronal regeneration enhances the expression of the immunophilin FKBP- 12
WE Lyons, JP Steiner, SH Snyder and TM Dawson
Division of Toxicological Sciences, Johns Hopkins School of Hygiene and Public Health, Baltimore, Maryland, USA.
Immunophilins are a group of proteins that serve as receptors for the
immunosuppressant drugs cyclosporin A and FK506. The immunophilin
designated FK-506 binding protein-12 (FKBP-12) is concentrated more than 10
times higher in the brain than in immune tissues. The complex of FK506 and
FKBP-12 inhibits the calcium activated phosphatase, calcineurin, increasing
phosphorylated levels of calcineurin substrates with growth associated
protein-43 (GAP-43), being most prominent in the brain. We now demonstrate
an association of FKBP-12 with neuronal regeneration and GAP-43
disposition. Facial nerve crush markedly augments expression of FKBP-12
mRNA in the facial nucleus with a time course paralleling changes in GAP-43
mRNA. Following sciatic nerve lesions, similar increases in FKBP-12 mRNA
occur in lumbar motor neurons and dorsal root ganglia neuronal cells.
Increased FKBP-12 expression appears linked to regeneration rather than
degeneration as facial nerve lesions elicited by ricin injection, which
produce neuronal death without regeneration, fail to augment FKBP-12
expression in the facial nucleus. The time course for accumulation of
FKBP-12 in sciatic nerve segments following nerve crush indicates rapid
axonal transport at a rate similar to GAP-43.
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